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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89070fbd153811bf5e229935a9de888ee7db6a863f56c78df87c29431a013fda' 
  AND token = 'Tk+a8kRsTzRe6i+y+ZBIQvOPWlPyXHvhDtReV+ngDoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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