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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a01e863fb3d9b7a694f01296177d32b6297d9a4531bb86973b534d0c3b6585b' 
  AND token = '+k4+fzFV2UmvPazaNewk4XqS4NJ7GxIBHksICeidLD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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