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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831e1223933fdaad98291d0c7c563d0f56fc532707804012c8a519c4644a448c' 
  AND token = 'nxM8kx2j/8STQCuU5rsqQ5A8rPLx5Dd4PFwGNL7+FUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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