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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ebab3e2a8a28c1b6ec8cc62692514b7d69e38998f023a20d57bc4e8d1c53f0e' 
  AND token = 'zY8Fi3tOb+2Hqc7Uykzr8G1SdR6KoZLTeBlPeDrdQVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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