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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513d466f914021542c55f030ba36960d17706b2f574b57c583509d843aef2f2a' 
  AND token = 'rJGUObQsrPP6Gp02cRURiTM4lA1B/CG9xhUsKnU2/vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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