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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d2fc9904c1c19a48e04004a1286e9aa4434350d9c7d96450d5f33da7e6b053' 
  AND token = '/x87KZXTkZEn2jDrJIic1Cw9kW0gvEF3QgDKg+F1q1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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