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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ddc41107556a5172ebcfb8e933a62eba520ac165d7ef084aa855982508dbe05' 
  AND token = 'z4FjW8dTXzpgQntC1uTrmj3Rs+NGIkG5qygy/eY6AiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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