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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d135e0f1ab2a6ae056c6e66336c5c1cb6abce65802e566b2bf28fc5c88ba46c' 
  AND token = '8/6sJiLW9yyW60bsInoMn0i/y2kiqws9pBSMfp9tIyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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