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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5834d339faa205c515313c9b88c1ddcd76685b3d2e663f0ccd8d84e18239c3' 
  AND token = '7iBy1FYnS/kL2ycPizn+i5SHQjnr+SUMJuB1TMhZQaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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