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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd60c2a7cc514ffe4e38596f30edea6a32fbbc1d80437362af496192ae4159bb' 
  AND token = 'lYn6kE37qoWcaq6weWt743Z/1ky55KzQUwP4hnVhxS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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