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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1408e4e6f8cdd5908860f94529ae6b6fa06488cf68e2cf8c7d7593a0723d9a2' 
  AND token = 'XcNBCNVDLT12WIJi1i54fqBjteVUJYEklVNIy7ppwoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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