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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f557ab0e32d2c622f71af08a9a337261f6a69800a06893f92cea9549becb55' 
  AND token = 'mRAtutx6KWbDH8X/7mhiCAlKUu7OUIbdJwnoALkcVHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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