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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0b7d3ccc9a5a811474953c73f94198de34189036807f998fab790be060d250' 
  AND token = 'HccBK9JfdMb/r+bSLTTB8gzwSHlpbT/aTIU1H2sHUHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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