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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934a0ae141272878cba34de7bf17e7f380bb36c1e8cdb7074ff4b2aa89711fea' 
  AND token = 'CSgdRZ6MrsRdz4Wyjf79SbWAjmH2lQ1CxWTTwe6//R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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