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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8567632bc24846e2fcdd27b06994bdca4050d959cf66a8833b91eb5703f190a3' 
  AND token = 'XEui9SLufMvCrDTeoELGsVJuXFBslB8IVi59gL8Pq84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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