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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb413831e4b384ef6088933062e905bc44845b3a972a2e12c57cfb3c2dbdbcf5' 
  AND token = 'Gy8p+mGJmk7Y2XpIuxGpU0LfemR56/URUSSni+9/GHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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