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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaca7c12eeeddaea96bb30729edc96526f7b3b5fe8be2d11f02c405659c4df19' 
  AND token = 'w2Is42rGbJnK/6wjRSOzbA0QJhcBmTlDsmh8uhAGAbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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