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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55650dca04d828993fe5248babdb00704ecb9ac6631de37dfa74aae2e77b656' 
  AND token = 'Hmj+RMJOM3VF47+E2esqxSfZkTU8KSithmQmxAx4HIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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