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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bb2b7105ef0dff765190bbe9c7a87b0abb6b5e100612ebf120c0b458d30ace' 
  AND token = '5MiV824gz3EACX/2hNPbMB3qZtWWL5OZmEqRD/Gjs3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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