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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896520365f5c7713b473f0c11273805307f5c4d8a7c675ee29e5c0d108b46963' 
  AND token = '8KRq2u5Tr1ThUunF1nt3ILX7TKzmJnm8vUZ29sNdldQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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