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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af77de86d5b5af256a5a32acffbe7e2f97cd0a9dceed30e61b08b19f3abd51c' 
  AND token = 'Ws6wN4P6iYLdLR5wW7OJQPgKu3ffRsmHx3Uwq2ifjrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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