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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e8b33ecf98f6213983e43b8076e27db38a1970946cb2fa1e9512beefc9d3ee' 
  AND token = 'sglHHkL++bnmByt+160oi9jKeL28YW4hthwAfLMDqE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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