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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25dbfddd824141b74e237ec4e995c96b9f0eec30d020d7ec6960908a8098d0c' 
  AND token = 'FpcWPJZtmQnwJfRVeKn7vtPs6hu1uTpx7OVKaSMOrXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}