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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c91b7b7d1e84f2dbeabd8dd0b2fefb9481bc2e627d74988a0609aceee999cf' 
  AND token = 'Hu1JuhNSYddAPn6zRLi3tvxiJeX9CEOsG8gSP3FYHkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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