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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0fa3d190198da9f084ad3185cb441d0cf54e99555e3b8d4f9aa0561b5f9abd' 
  AND token = 'kVpMtwciiCqLnm4I7eSiq2zLuOCZfcpZ3ew9IVeI4NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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