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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b3a6e77f9f9b86d471af2b9db250cc1f69893c1ce383de3c6d4822bfad7d33' 
  AND token = 'pPRPHHsbU8tzgcakM9OqED4u8+Fug/NOVw+RI9OVNU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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