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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec423a6e9dcd036fb55f71fcb3249e9e43491a262b5b71e471b5c557358e731' 
  AND token = 'rpmfeatHr+isYTOW+COion+HlqECsPVAzQ/5EM6diEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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