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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32dd5f7ff0dafc845c7ef2e6f5f30628f2fcde48fa4c07fe1774cde2cab5b13' 
  AND token = 'BXPj9w9tcBRl4Qk6k0R/peUr5/ygzLl7jNoLVbx6DXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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