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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46b88039ebe2730f077522704431cb0e98b4684bcdb8e722e50575d3f1c3f24' 
  AND token = 'wZhtI4kkYJjOW2Rbw09CIL4fvV3t+HWHbSnnU9HTD7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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