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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f679efc41583333ce2b4c777715edcc514178a6f6890e25cb0aaa1093b5d646' 
  AND token = 'x/kyl1aOMIQYsymvjJrllIWeYgxm1/LfARAkods2IZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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