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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a70b085b652cc335cd13f87abba5695ebb9dbcb7b1faacdf779e34ff4fcc25e' 
  AND token = 'O9Oq/a5T4g26bL6q9nnOfPFwEoZzila6La2VCpIUMYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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