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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a06a4990271fe02dcf777d2867028f04c3ff393feb0ec3077cf2dd332ff9c0e' 
  AND token = 'RFPKu0ZoXGvtg7ry7WmC3W+shZt/Mp2qECpIIUvO8F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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