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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13505d6f237e6ca3f49bb9dc547c8b787fcb2b245279773bda0956256b666822' 
  AND token = '2SO1ztliSsOPw8oPLShfp3MsvleDQ2DAy4Uzr2iAzBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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