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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53c14e08bb984892bfc96e9ab86b5bd5c62489f8ba5a7aab84948271fde1dff3' 
  AND token = 'HdaHxhfvPskUJMgfB1dehFTfdYnNM7mfsU7NfbzC4/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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