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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18d528dd37a69c66e858a2fc2efbe6e1890409eb7a8bbcacc71bc7aae126eb7' 
  AND token = 'XN277slmltPts21/NXsdDkq6GUUBP/FnvNgs/nioSbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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