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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c813924b3a89f89037db58efbf341c8d7155e2e7ffa9768286b04590be3d4dc2' 
  AND token = 'AXIQ54l0VWsKoL/WxeX745bw4+hCUtHR9GieUZUpauU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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