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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98c1eacf6d76faa02fb4b25e7175843a42cf9ef6a2cf044c8b9df7d2885c86f' 
  AND token = 'B4dNsplxpmx+eR1ILSlUjYCCQl6V78HQEuRqHBkm7AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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