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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a210592026474fd1b196fdd0a87c5e7c208c95cd347818423d9ff9bddefed9a' 
  AND token = '5m7V8UZFXoun+reTqTWYr0shoNuU6AxXvi5gu97M5NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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