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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b5db308632acef5e30a1d5a84d71632e5f6df85033cd959bac74add72cf94f' 
  AND token = 'fP6JqnqyuoqsPYrTS0HtBY3KYcuCxe9PfSY+LMGy9lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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