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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3f9050015f97fd8f5cc5d5c8511b2cfc287dfa5e559b7f3df65fbf557cbb12' 
  AND token = 'bwU5gCCUFQGVb7cmaU0VdXRSSgBLhR+6/A3C6AjFk4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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