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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a65187b5d6777587f44bb57bd9da679968a096b613de4e1975bd194d10e62b8' 
  AND token = 'kOrMTIFfLcmzqaQUKfNCSah/vmk26sxUFNs3UVcqbiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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