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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4337c7e86683814cf61119f7a4a0b440284af447206bfae896185f93fa613a73' 
  AND token = 'cfypGGf4U2485pgYwsPIHtiawi3IWTdex3XZjNJVuuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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