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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8566f8c29cfb1021097102a32c3f1d6149804d9d8e528dcc79498564b29612' 
  AND token = '5+Cpnz8Qi0ueY/7o+lCL9PBzRzNP5pgz0I84k/BXMbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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