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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2784677e09fba6ebfabcd48c4b3f176f9a628deb083d91aa62ead6085c2707df' 
  AND token = 'KymRwVdb3wmJTuDiMwJHFKAleeo8vIEB0QSSvycQb08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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