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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabb2db090daa02dd73eb34edc5b732b19eb1da4754d0d9f13d5e0511ed2a333' 
  AND token = '9jWtcY6Q71APEXHGdt4Ipk6Ve7DPHAyAKXGncXm6u0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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