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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93855015c2b5b0bfc07f8343ed52d06a7364459f3db2c800dc581ececfa12288' 
  AND token = '4G3XcgVEVHCyLQCvn0Pd2MVz3OQT/lrLqdBJyp7Ci10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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