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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2af96a2ef7e946fd8ccb90a763f47916243d18f5f0b4dc14d85adec00eb190' 
  AND token = 'e6rewMEpj6EzkXzvp893Nj286Lst6SjMEtFR5hvbhas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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