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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23a26c207ed6567360ecddf14fc2d14a503b0a7fa02dc0b68953374a6be0e25' 
  AND token = 'oDmSTaqWgAIncZTKqNBrkV0jbF/cRA+uETw/aFYW2/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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