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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd8d7c31028e80dfc6bd2cc4e1803786e214fc03a16bacdea52cc5edbc775fb' 
  AND token = 'f7JGoanQUHg3jnDpGbhI1af00j/mZE0tjvqk6wGNZJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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