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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f8716b58149a0366fb219783577787e6a923405d6ed62ef2d6141faf9a498e' 
  AND token = '5HqVI5+bQZSsVa1nLRxdtGAZr0ZN5PGSb3kJIbIKOvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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