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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0831e6f6817a921e4bf710ded5d45e527ff6791ed1ec4b8971ccbeb6055f43c8' 
  AND token = 'T1DT8muREE3LLs37WTYt07iBg8qFLxMmwOdCg3ZwSKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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