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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b9b9b605a21f3b1d7744493ec6c1a6387587d889ba25a6e7bb26e337899e93' 
  AND token = 'GAOoaFjBLasIAoO65ZyZCGQ009lqsRm8Pq+d35Q804I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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